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f60c8ba7 ST |
1 | /* |
2 | * LED support for the input layer | |
3 | * | |
4 | * Copyright 2010-2015 Samuel Thibault <samuel.thibault@ens-lyon.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/leds.h> | |
16 | #include <linux/input.h> | |
17 | ||
18 | #if IS_ENABLED(CONFIG_VT) | |
19 | #define VT_TRIGGER(_name) .trigger = _name | |
20 | #else | |
21 | #define VT_TRIGGER(_name) .trigger = NULL | |
22 | #endif | |
23 | ||
24 | static const struct { | |
25 | const char *name; | |
26 | const char *trigger; | |
27 | } input_led_info[LED_CNT] = { | |
28 | [LED_NUML] = { "numlock", VT_TRIGGER("kbd-numlock") }, | |
29 | [LED_CAPSL] = { "capslock", VT_TRIGGER("kbd-capslock") }, | |
30 | [LED_SCROLLL] = { "scrolllock", VT_TRIGGER("kbd-scrolllock") }, | |
31 | [LED_COMPOSE] = { "compose" }, | |
32 | [LED_KANA] = { "kana", VT_TRIGGER("kbd-kanalock") }, | |
33 | [LED_SLEEP] = { "sleep" } , | |
34 | [LED_SUSPEND] = { "suspend" }, | |
35 | [LED_MUTE] = { "mute" }, | |
36 | [LED_MISC] = { "misc" }, | |
37 | [LED_MAIL] = { "mail" }, | |
38 | [LED_CHARGING] = { "charging" }, | |
39 | }; | |
40 | ||
41 | struct input_led { | |
42 | struct led_classdev cdev; | |
43 | struct input_handle *handle; | |
44 | unsigned int code; /* One of LED_* constants */ | |
45 | }; | |
46 | ||
47 | struct input_leds { | |
48 | struct input_handle handle; | |
49 | unsigned int num_leds; | |
50 | struct input_led leds[]; | |
51 | }; | |
52 | ||
53 | static enum led_brightness input_leds_brightness_get(struct led_classdev *cdev) | |
54 | { | |
55 | struct input_led *led = container_of(cdev, struct input_led, cdev); | |
56 | struct input_dev *input = led->handle->dev; | |
57 | ||
58 | return test_bit(led->code, input->led) ? cdev->max_brightness : 0; | |
59 | } | |
60 | ||
61 | static void input_leds_brightness_set(struct led_classdev *cdev, | |
62 | enum led_brightness brightness) | |
63 | { | |
64 | struct input_led *led = container_of(cdev, struct input_led, cdev); | |
65 | ||
66 | input_inject_event(led->handle, EV_LED, led->code, !!brightness); | |
67 | } | |
68 | ||
69 | static void input_leds_event(struct input_handle *handle, unsigned int type, | |
70 | unsigned int code, int value) | |
71 | { | |
72 | } | |
73 | ||
b38ebd1d DT |
74 | static int input_leds_get_count(struct input_dev *dev) |
75 | { | |
76 | unsigned int led_code; | |
77 | int count = 0; | |
78 | ||
79 | for_each_set_bit(led_code, dev->ledbit, LED_CNT) | |
80 | if (input_led_info[led_code].name) | |
81 | count++; | |
82 | ||
83 | return count; | |
84 | } | |
85 | ||
f60c8ba7 ST |
86 | static int input_leds_connect(struct input_handler *handler, |
87 | struct input_dev *dev, | |
88 | const struct input_device_id *id) | |
89 | { | |
90 | struct input_leds *leds; | |
91 | unsigned int num_leds; | |
92 | unsigned int led_code; | |
93 | int led_no; | |
94 | int error; | |
95 | ||
b38ebd1d | 96 | num_leds = input_leds_get_count(dev); |
f60c8ba7 ST |
97 | if (!num_leds) |
98 | return -ENXIO; | |
99 | ||
100 | leds = kzalloc(sizeof(*leds) + num_leds * sizeof(*leds->leds), | |
101 | GFP_KERNEL); | |
102 | if (!leds) | |
103 | return -ENOMEM; | |
104 | ||
105 | leds->num_leds = num_leds; | |
106 | ||
107 | leds->handle.dev = dev; | |
108 | leds->handle.handler = handler; | |
109 | leds->handle.name = "leds"; | |
110 | leds->handle.private = leds; | |
111 | ||
112 | error = input_register_handle(&leds->handle); | |
113 | if (error) | |
114 | goto err_free_mem; | |
115 | ||
116 | error = input_open_device(&leds->handle); | |
117 | if (error) | |
118 | goto err_unregister_handle; | |
119 | ||
120 | led_no = 0; | |
121 | for_each_set_bit(led_code, dev->ledbit, LED_CNT) { | |
122 | struct input_led *led = &leds->leds[led_no]; | |
123 | ||
124 | led->handle = &leds->handle; | |
125 | led->code = led_code; | |
126 | ||
b38ebd1d | 127 | if (!input_led_info[led_code].name) |
f60c8ba7 ST |
128 | continue; |
129 | ||
130 | led->cdev.name = kasprintf(GFP_KERNEL, "%s::%s", | |
131 | dev_name(&dev->dev), | |
132 | input_led_info[led_code].name); | |
133 | if (!led->cdev.name) { | |
134 | error = -ENOMEM; | |
135 | goto err_unregister_leds; | |
136 | } | |
137 | ||
138 | led->cdev.max_brightness = 1; | |
139 | led->cdev.brightness_get = input_leds_brightness_get; | |
140 | led->cdev.brightness_set = input_leds_brightness_set; | |
141 | led->cdev.default_trigger = input_led_info[led_code].trigger; | |
142 | ||
143 | error = led_classdev_register(&dev->dev, &led->cdev); | |
144 | if (error) { | |
145 | dev_err(&dev->dev, "failed to register LED %s: %d\n", | |
146 | led->cdev.name, error); | |
147 | kfree(led->cdev.name); | |
148 | goto err_unregister_leds; | |
149 | } | |
150 | ||
151 | led_no++; | |
152 | } | |
153 | ||
154 | return 0; | |
155 | ||
156 | err_unregister_leds: | |
157 | while (--led_no >= 0) { | |
158 | struct input_led *led = &leds->leds[led_no]; | |
159 | ||
160 | led_classdev_unregister(&led->cdev); | |
161 | kfree(led->cdev.name); | |
162 | } | |
163 | ||
164 | input_close_device(&leds->handle); | |
165 | ||
166 | err_unregister_handle: | |
167 | input_unregister_handle(&leds->handle); | |
168 | ||
169 | err_free_mem: | |
170 | kfree(leds); | |
171 | return error; | |
172 | } | |
173 | ||
174 | static void input_leds_disconnect(struct input_handle *handle) | |
175 | { | |
176 | struct input_leds *leds = handle->private; | |
177 | int i; | |
178 | ||
179 | for (i = 0; i < leds->num_leds; i++) { | |
180 | struct input_led *led = &leds->leds[i]; | |
181 | ||
182 | led_classdev_unregister(&led->cdev); | |
183 | kfree(led->cdev.name); | |
184 | } | |
185 | ||
186 | input_close_device(handle); | |
187 | input_unregister_handle(handle); | |
188 | ||
189 | kfree(leds); | |
190 | } | |
191 | ||
192 | static const struct input_device_id input_leds_ids[] = { | |
193 | { | |
194 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT, | |
195 | .evbit = { BIT_MASK(EV_LED) }, | |
196 | }, | |
197 | { }, | |
198 | }; | |
199 | MODULE_DEVICE_TABLE(input, input_leds_ids); | |
200 | ||
201 | static struct input_handler input_leds_handler = { | |
202 | .event = input_leds_event, | |
203 | .connect = input_leds_connect, | |
204 | .disconnect = input_leds_disconnect, | |
205 | .name = "leds", | |
206 | .id_table = input_leds_ids, | |
207 | }; | |
208 | ||
209 | static int __init input_leds_init(void) | |
210 | { | |
211 | return input_register_handler(&input_leds_handler); | |
212 | } | |
213 | module_init(input_leds_init); | |
214 | ||
215 | static void __exit input_leds_exit(void) | |
216 | { | |
217 | input_unregister_handler(&input_leds_handler); | |
218 | } | |
219 | module_exit(input_leds_exit); | |
220 | ||
221 | MODULE_AUTHOR("Samuel Thibault <samuel.thibault@ens-lyon.org>"); | |
222 | MODULE_AUTHOR("Dmitry Torokhov <dmitry.torokhov@gmail.com>"); | |
223 | MODULE_DESCRIPTION("Input -> LEDs Bridge"); | |
224 | MODULE_LICENSE("GPL v2"); |